通过API获取HDFS统计信息时报Access denied错误信息，错误信息如下：

org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException): Access denied for user xusweeter. Superuser privilege is required

    at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkSuperuserPrivilege(FSPermissionChecker.java:122)

    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkSuperuserPrivilege(FSNamesystem.java:5909)

    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.datanodeReport(FSNamesystem.java:4944)

    at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getDatanodeReport(NameNodeRpcServer.java:1039)

    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getDatanodeReport(ClientNamenodeProtocolServerSideTranslatorPB.java:698)

    at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)

    at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)

    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)

    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)

    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)

    at java.security.AccessController.doPrivileged(Native Method)

    at javax.security.auth.Subject.doAs(Subject.java:422)

    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698)

    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)

    at org.apache.hadoop.ipc.Client.call(Client.java:1475)

    at org.apache.hadoop.ipc.Client.call(Client.java:1412)

    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)

    at com.sun.proxy.$Proxy46.getDatanodeReport(Unknown Source)

    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getDatanodeReport(ClientNamenodeProtocolTranslatorPB.java:626)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:606)

    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191)

    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)

    at com.sun.proxy.$Proxy47.getDatanodeReport(Unknown Source)

    at org.apache.hadoop.hdfs.DFSClient.datanodeReport(DFSClient.java:2554)

    at org.apache.hadoop.hdfs.DistributedFileSystem.getDataNodeStats(DistributedFileSystem.java:1196)

    at org.apache.hadoop.hdfs.DistributedFileSystem.getDataNodeStats(DistributedFileSystem.java:1190)

    at com.pub.file.business.HDFSManager.getDataNodeStats(HDFSManager.java:77)

    at com.pub.file.business.PubFileManager.getDataNodeStats(PubFileManager.java:1493)

    at com.pub.file.business.PubFileManager$$FastClassByCGLIB$$6d05010e.invoke(<generated>)

    at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)

    at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:692)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)

    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:625)

    at com.framework.impl.PubFileServiceImpl$$EnhancerByCGLIB$$16656aaf.getDataNodeStats(<generated>)

    at com.pub.file.action.PubFileStoreAction.showAnalysis4TotalStore(PubFileStoreAction.java:218)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:606)

    at com.common.crud.EntityAction.execute(EntityAction.java:104)

    at sun.reflect.GeneratedMethodAccessor386.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:606)

    at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:892)

    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)

    at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)

    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)

    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)

    at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)

    at ognl.ASTMethod.getValueBody(ASTMethod.java:91)

    at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)

    at ognl.SimpleNode.getValue(SimpleNode.java:258)

    at ognl.Ognl.getValue(Ognl.java:467)

    at ognl.Ognl.getValue(Ognl.java:431)

    at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)

    at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)

    at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)

    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)

    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)

    at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)

    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)

    at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)

    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)

    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)

    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)

    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)

    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)

    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)

    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:575)

    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)

    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)

    at com.common.SysFilterDispatcher.doFilter(SysFilterDispatcher.java:162)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

    at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

    at com.common.util.CodeTransferFilter.doFilter(CodeTransferFilter.java:59)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)

    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)

    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)

    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)

    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

    at java.lang.Thread.run(Thread.java:745)

解决办法：在hdfs-site.xml中添加取消权限控制的参数。

<configuration>

    <property>

        <name>dfs.permissions.enabled</name>

        <value>false</value>

    </property>

</configuration>

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